Jaime Lannister

Eldest son of Lord Tywin, the powerful Lord of Casterly Rock in the west of the Seven Kigndoms, Jaime would be heir if it were not for the fact that he is the most notorious of the Kingsguard, one of the seven knights sworn to protect the king and to give up marriage, lands, and titles. Though his bravery and his prowess is unquestioned—many would consider him the best knight in the Seven Kingdoms—he is infamous for having murdered the last king, the mad Aerys II, despite his vows as a Kingsguard. The Starks and Lannisters are firmly opposed to one another, and much of this has to do with Jaime and his actions during the Sack of King’s Landing

He is Queen Cersei’s twin brother, and both share the golden-haired, green-eyed good looks of the Lannisters.